Data Wizard problems

I would like to use the data wizard's Microsoft query to modify my UserInfo.dat file. Currently it throws a ORA12154 error.
I first go through creating a data source.
I chose Microsoft ODBC driver since the DB i have is oracle.
Here is the connection string I use under the "Server" text field.

This throws a ORA-12154 error.
Below is my sqlnet.ora file:

# This file is actually generated by netca. But if customers choose to
# install "Software Only", this file wont exist and without the native
# authentication, they will not be able to connect to the database on NT.


Below is my tnsnames.ora file: =
(Description =
(SID = udbnav)